Final answer:
When a state law conflicts with a national law, a state judge must uphold the Constitutional law, as stated in the Supremacy Clause of the Constitution.
Step-by-step explanation:
When a state law is in conflict with a national law, a state judge must uphold the Constitutional law, as stated in the Supremacy Clause of Article VI of the Constitution. This clause establishes that the Constitution, national laws, and national treaties are the "supreme law of the land," and judges in every state must comply with the Constitution even if it contradicts state laws.
If a conflict between state and national laws arises, the state judge does not have the authority to refer the matter to a federal court or municipal court. Instead, they are bound by the Supremacy Clause to uphold the Constitutional law.